The aim of the study is to determine, in terms of the prevalence of influence of natural or technogenic factors, the factors of formation of the hydrogeochemical composition of productive Lower Jurassic deposits of the Talinskoye oil field. During the study, the authors of the article evaluated the effects of sedimentogenesis, elutriation, neotectonic processes and oilfield water injection on the chemical composition of the waters studied. Water injection is known to cause changes in the hydrogeochemical balance and the formation of technogenic hydrogeological systems. Formation water salinities currently range from 3.7 to 15.3 g/dm³. More than 8960.3 thou-sand m³ of water was injected from overlying sediments into productive formations to maintain reservoir pressure (2014-2021). The authors analysed the genetic coefficients of different types of water (including injected water). Then they compared the coefficients. It was concluded that injected water currently doesn't have a significant impact on the hydrogeochemical appearance of the productive Lower Jurassic reservoirs of the Talinskoye oil field.

The development of Western Siberia is one of the most large-scale scientific and production and socio-economic projects of the country in the 20^th century. The state approach, scientific justification, production of necessary equipment, organization of transport and geological exploration work were linked into a single complex project of Union scale. Main Department of oil and gas exploration was organized in the Ministry of geology of USSR, and on January 15, 1948 there was signed an order on organization of the first oil exploratory expedition in Tyumen. In January 1950, the Scientific and Technical Council of the Ministry of Geology of the USSR adopted a master plan for the study and development of the West Siberian plate, including the placement on its territory of 26 anchor wells, regional seismic profiles, and carrying out prospecting in the area of anchor wells. As a result, gas fields were discovered in the Berezovsky area, and a few years later, Shaimskoye, Megionskoye, and Ust-Balykskoye oil fields were discovered. Efficient organization of works and state approach enabled to discover in a short time large oil reserves in Shirochnoye Priobie and unique natural gas reserves in the north of Western Siberia. In December 1963, a special Resolution of the USSR Council of Ministers was adopted to prepare for pilot production of the fields, to create an infrastructure for the development of geology and oil production, as well as scientific research and industrial institutes. The achievements of geologists provided the necessary basis for the creation of the largest fuel and energy complex. Social and economic development of the region and the country as a whole was associated with it.

After reviewing global experience, the authors of the article outline approaches to justify the use of polymer flooding technology in their work. Results from laboratory studies on low viscosity objects are generalized. Polymer flooding has the potential to increase oil recovery by 10–15 % compared to standard flooding, as demonstrated by tests on core samples with permeabilities of 116 and 527 mD. The values of the residual resistance factor are 5 and 2 for cores of 116 and 527 mD, respectively. This distribution of the residual resistance factor will not only fail to smooth the displacement front in the reservoir, but it will also further isolate the low permeability interlayers.

The authors of the article used a synthetic model of one of the zones to evaluate the effectiveness of polymer flooding in the J₂ reservoir in the Ust-Tegusskaya area of the Malyka field. The increase in the oil recovery factor can be up to 4 %. The contribution of parameters such as the level of adsorption, reservoir heterogeneity in terms of permeability, the presence of highly conductive channels and the energy reserve to the magnitude of the effect of polymer flooding has been established.

The article presents results of tests of software that implements the D-CRMP model. D-CRMP is a version of the analytical capacitance-resistance model (CRM) that is primarily used for waterflood characterization and reservoir management. The difference of D-CRMP lies in its ability to take into account the shut-in periods of production wells during history matching. The optimization problem is solved by means of simulated annealing and sequential least-squares quadratic programming from the SciPy library. The study considers the feature of solving the D-CRMP equation related to the errors in the reservoir liquid production forecast when previously shut-in well starting its production. The selection of the objective function and constraints, which are preferable when using the mentioned algorithms for D-CRMP history matching, is made. A method for choosing the best model is indicated when using an algorithm, which is dependent on pseudorandom number generator. The choice is made taking into account the predictive properties of the models. An approach to calculating confidence intervals based on the F-test is considered in detail. Evaluation of confidence intervals is caried out.

There is currently a significant depletion of Cenomanian gas reserves in Western Siberia, which have been the basis of Russian gas exports. This raises the challenge of developing reserves that could offset these volumes, such as hard-to-recover gas reservoirs in Turonian formations overlying the Cenomanian. To date, there is virtually no experience of commercial exploitation of Turonian reservoirs, which, combined with their extremely low permeability, makes Turonian gas uneconomic to produce. In order to increase the economic viability of developing such reservoirs, the authors of the article propose a reservoir engineering method using an interlayer gas flow. This method allows you to reduce the initial costs. The article presents hydrodynamic calculations of the development of Turonian and Cenomanian reservoirs using a natural flow production and an inter-layer gas flow. The modelling results demonstrate the effectiveness of the proposed technology.

Industrial dewaxing of oil raffinates remains the most expensive, complex, low-temperature process in the production of mineral base oils in refining. The development of an alternative, simpler and less energy-intensive method of dewaxing is an urgent task.

This article investigates the possibility of dewaxing oil refining in the presence of different classes of depressor additives in a constant inhomogeneous electric field at positive temperatures.

A correlation was established between the depressant properties of the additives and their effectiveness in electric field dewaxing.

The maximum depressant effect of the additive in the oil raffinate corresponds to the highest indicators of the electrical dewaxing process.

The effect of separating oil raffinate in an electric field with ester additives depends on the chemical structure of the dicarboxylic acids used in their synthesis.

The nature of the distribution of the additive between the phases has been revealed by changes in the pour point of the resulting dewaxed oil.

This article shows the relationship between the magnitude of the electrical charge of paraffin crystals and the time of dewaxing. This is related to the polarisation of the double electric layer of particles in an electric field and their subsequent dipole-dipole interaction.

Early prediction of an emergency situation is of great importance, especially for objects with high accident costs. This is due to the fact that, according to the signals of early diagnosis, it is possible to stop the development of an emergency before it enters an irreversible phase, when it is already necessary to consider the consequences of the accident. There are two important aspects to this work. Firstly, the timely detection of the signal at the beginning of the development of abnormal operation of the equipment; secondly, it is necessary to clearly filter out false signals, since they can lead to unmotivated shutdown of the equipment and economic losses.

The way out of this situation is seen in the combination of different methods, so that different interferences, which are fundamental for one method, have little effect on the results given by another method. This approach, together with appropriate processing of the results, will provide reliable data at the beginning of the emergency development of the process.

This article discusses highly sensitive methods of early diagnosis to determine the time of safe operation of equipment when a signal of the onset of an emergency process is detected. This al-lows an informed decision to be made in the presence of an emergency development model: to stop work immediately or to continue operating the equipment without serious risk until the next scheduled repair.

The article considers combined methods of diagnosis: fragile strain-sensitive coatings, acoustic emission and aerosol particle generation, technical vision.

A methodological evaluation of the physical and mechanical properties of the coatings, the relationship between the stress and strain values and the parameters of the output signals of the devices under laboratory conditions was carried out on beams of various profiles, which made it possible to improve the accuracy of the measurements and the quality of the new strain-sensitive coatings.